#include <stdio.h>

int main(void)
{
	int year;

	printf("Input the year: ");
	scanf("%d", &year);
	if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
		printf("%d is a leap year.\n", year);
	else
		printf("%d is not a leap year.\n", year);

	return 0;
}